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 bytes:    sent: 2.15 M    recv: 39.10 M Interface: eth0    Bytes-sent:          2.15 M (total)         0.00 B/s  (Per-Sec)    Bytes-recv:         39.10 M (total)       120.00 B/s  (Per-Sec)    pkts

TIME CMD Root 1 0 0 19:05 ? 00:00:00 sleep 1000 Listing 2 Process on the Host $ ps -ef|grep sleep Cherf 30328 29757 0 20:44 ? 00:00:00 sleep 1000 Cherf 30396 3353

Effectively monitoring your cluster can be one of the keys to understanding how the hardware and software are interacting. In many cases, this means examining the performance of a single node. ... # Kernel: 2.6.32-220.4.1.el6.x86_64 Memory: 7540044 Swap: # NumDisks: 2 DiskNames: sdb sda # NumNets: 2 NetNames: lo: eth0:100 # NumSlabs: 201 Version: 2.1 # SCSI: DA:1:00:00:00 DA:2:00:00:00 CD:4:00:00:00 ... Effectively monitoring your cluster can be one of the keys to understanding how the hardware and software are interacting. In many cases, this means examining the performance of a single node.

in mv ubuntu@aws:~/slow-mv$ strace -t mv 3GB.copy 3GB 19:00:09 execve("/bin/mv", ["mv", "3GB.copy", "3GB"], 0x7ffd0e7dddf8 /* 21 vars */) = 0 19:00:09 brk(NULL) = 0x55cd7d1ce000

) 01/31/2013 _i686_ (1 CPU)01/31/2013 09:56:01 AM avg-cpu: %user %nice %system %iowait %steal %idle 14.78 0.38 3.47 2.16 0.00 79.21 Device: rrqm/s wrqm

16384 Nov 10 10:00 lost+found 4 drwxr-xr-x. 3 root root 4096 Nov 10 10:00 .. 4 -rw-r--r-- 1 root root 294 Nov 10 10:07 s3ql_passphrase 4 -rw-r--r-- 1 root root 243 Nov 10 10:07 s3ql_seq_no_1 4 -rw

writing code. Columns 1 to 5 could be used for statement labels such as the following: ...       SUM = 0.0       D0 100 I=1,10          SUM = SUM + REAL(I)  100  CONTINUE ...       Y = X1 + X2 + X3

can see how the arp cache poisoning works: $ sudo nemesis arp -v -r -d eth0 -S 192.168.1.2 \ -D 192.168.1.133 -h 00:22:6E:71:04:BB -m 00:0C:29:B2:78:9E \ -H 00:22:6E:71:04:BB -M 00:0C:29:B2:78:9E

:Ethernet HWaddr 08:00:27:b0:21:7e inet addr:192.168.1.85 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:feb0:217e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU

 Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices           fast   vg-cache -wi-a-----  10.00g                                                     /dev/nvme0n1(0)   slow   vg-cache -wi-a-----   5.93t                                                     /dev/sdb(0